Liquid crystal display panel and display apparatus using the same

Abstract

The present invention provides a liquid crystal display (LCD) panel and a display apparatus using the same. In the LCD panel, a second electrode of the second substrate comprises a trunk portion and a plurality of branch portion, and each of the pixels comprises a main pixel region and a sub-pixel region, and an included angle between the trunk portion and the branch portions is of 45 degrees in the main pixel region, and in each of the sub-pixel regions, a predetermined angle between the trunk portion and the branch portions is not equal to 45 degrees. The λ/2 pattern retarder film of the LCD panel comprises λ/2 retarder rows and zero wave retarder rows.

The invention claimed is: 
     
       1. A liquid crystal display panel comprising:
 a first substrate comprising a first electrode; 
 a second substrate comprising a second electrode and a plurality of pixels, wherein each of the pixels comprises a main pixel region and a sub-pixel region, and the second electrode has a pixel electrode structure, and the pixel electrode structure comprises a trunk portion and a plurality of branch portions, and an included angle between the trunk portion and the branch portions is 45 degrees in the main pixel region, and the sub-pixel regions comprise first sub-pixel regions and second sub-pixel regions, and in each of the sub-pixel regions, a predetermined angle between the trunk portion and the branch portions is less or greater than 45 degrees, and the predetermined angle is different in the first sub-pixel regions and the second sub-pixel regions, respectively; 
 a liquid crystal layer formed between the first substrate and the second substrate, and the liquid crystal layer comprises reactive monomers and liquid crystal molecules; 
 a first polarizer disposed at an outer side of the first substrate; 
 a second polarizer disposed at an outer side of the second substrate; and 
 a half wave (λ/2) pattern retarder film bonded on an outer surface of the first substrate or the second substrate, wherein the λ/2 pattern retarder film comprises a plurality of λ/2 retarder rows and a plurality of zero wave retarder rows, and the zero wave retarder rows are positioned to overlap the main pixel regions, and the λ/2 retarder rows are positioned to overlap the sub-pixel regions. 
 
     
     
       2. The liquid crystal display panel according to  claim 1 , wherein the sub-pixel regions further comprise third sub-pixel regions, and the predetermined angle in the third sub-pixel regions is different to the predetermined angles in the first sub-pixel regions and the second sub-pixel regions. 
     
     
       3. The liquid crystal display panel according to  claim 2 , wherein the sub-pixel regions further comprise fourth sub-pixel regions, and the predetermined angle in the fourth sub-pixel regions is different to the predetermined angles in the first sub-pixel regions, the second sub-pixel regions and the third sub-pixel regions. 
     
     
       4. The liquid crystal display panel according to  claim 1 , wherein the λ/2 pattern retarder film is positioned between the second substrate and the second polarizer. 
     
     
       5. The liquid crystal display panel according to  claim 4 , wherein the predetermined angle (θ 2 ) is less than 45 degrees, and there is an included angle (Ψ 1 ) between slow axes of the λ/2 pattern retarder film and absorption axis of the second polarizer, and the predetermined angle (θ 2 ) and the included angle (Ψ 1 ) satisfy the below equations:
   Ψ 1 +θ 2 =45°; and
 
   90−θ 2 >2Ψ 1 .
 
 
     
     
       6. The liquid crystal display panel according to  claim 1 , wherein the λ/2 pattern retarder film is positioned between the first substrate and the first polarizer. 
     
     
       7. The liquid crystal display panel according to  claim 6 , wherein the predetermined angle (θ 2 ) is greater than 45 degrees, and there is an included angle (Ψ 2 ) between slow axes of the λ/2 pattern retarder film and absorption axis of the first polarizer, and the predetermined angle (θ 2 ) and the included angle (Ψ 1 ) satisfy the below equations:
   Ψ 2 +θ 2 =135°; and
 
   2(90−θ 2 )>Ψ 2 .
 
 
     
     
       8. A liquid crystal display panel comprising:
 a first substrate comprising a first electrode; 
 a second substrate comprising a second electrode and a plurality of pixels, wherein each of the pixels comprises a main pixel region and a sub-pixel region, and the second electrode has a pixel electrode structure, and the pixel electrode structure comprises a trunk portion and a plurality of branch portions, and an included angle between the trunk portion and the branch portions is 45 degrees in the main pixel region, and in each of the sub-pixel regions, a predetermined angle between the trunk portion and the branch portions is less or greater than 45 degrees; 
 a liquid crystal layer formed between the first substrate and the second substrate; 
 a first polarizer disposed at an outer side of the first substrate; 
 a second polarizer disposed at an outer side of the second substrate; and 
 a λ/2 pattern retarder film bonded on an outer surface of the first substrate or the second substrate, wherein the λ/2 pattern retarder film comprises a plurality of λ/2 retarder rows and a plurality of zero wave retarder rows, and the zero wave retarder rows are positioned to overlap the main pixel regions, and the λ/2 retarder rows are positioned to overlap the sub-pixel regions. 
 
     
     
       9. The liquid crystal display panel according to  claim 8 , wherein the sub-pixel regions comprise first sub-pixel regions and second sub-pixel regions, and the predetermined angle is different in the first sub-pixel regions and the second sub-pixel regions, respectively. 
     
     
       10. The liquid crystal display panel according to  claim 9 , wherein the sub-pixel regions further comprise third sub-pixel regions, and the predetermined angle in the third sub-pixel regions is different to the predetermined angles in the first sub-pixel regions and the second sub-pixel regions. 
     
     
       11. The liquid crystal display panel according to  claim 10 , wherein the sub-pixel regions further comprise fourth sub-pixel regions, and the predetermined angle in the fourth sub-pixel regions is different to the predetermined angles in the first sub-pixel regions, the second sub-pixel regions and the third sub-pixel regions. 
     
     
       12. The liquid crystal display panel according to  claim 8 , wherein the λ/2 pattern retarder film is positioned between the second substrate and the second polarizer. 
     
     
       13. The liquid crystal display panel according to  claim 12 , wherein the predetermined angle (θ 2 ) is less than 45 degrees, and there is an included angle (Ψ 1 ) between slow axes of the λ/2 pattern retarder film and absorption axis of the second polarizer, and the predetermined angle (θ 2 ) and the included angle (Ψ 1 ) satisfy the below equations:
   Ψ 1 +Ψ 2 =45°; and
 
   90−θ 2 >2Ψ 1 .
 
 
     
     
       14. The liquid crystal display panel according to  claim 8 , wherein the λ/2 pattern retarder film is positioned between the first substrate and the first polarizer. 
     
     
       15. The liquid crystal display panel according to  claim 14 , wherein the predetermined angle (θ 2 ) is greater than 45 degrees, and there is an included angle (Ψ 2 ) between slow axes of the λ/2 pattern retarder film and absorption axis of the first polarizer, and the predetermined angle (θ 2 ) and the included angle (Ψ 1 ) satisfy the below equations:
   Ψ 2 +θ 2 =135°; and
 
   2(90−θ 2 )>Ψ 2 .
 
 
     
     
       16. A display apparatus comprising a backlight module and a liquid crystal display panel, wherein the liquid crystal display panel comprises:
 a first substrate comprising a first electrode; 
 a second substrate comprising a second electrode and a plurality of pixels, wherein each of the pixels comprises a main pixel region and a sub-pixel region, and the second electrode has a pixel electrode structure, and the pixel electrode structure comprises a trunk portion and a plurality of branch portions, and an included angle between the trunk portion and the branch portions is 45 degrees in the main pixel region, and in each of the sub-pixel regions, a predetermined angle between the trunk portion and the branch portions is less or greater than 45 degrees; 
 a liquid crystal layer formed between the first substrate and the second substrate; 
 a first polarizer disposed at an outer side of the first substrate; 
 a second polarizer disposed at an outer side of the second substrate; and 
 a λ/2 pattern retarder film bonded on an outer surface of the first substrate or the second substrate, wherein the λ/2 pattern retarder film comprises a plurality of λ/2 retarder rows and a plurality of zero wave retarder rows, and the zero wave retarder rows are positioned to overlap the main pixel regions, and the λ/2 retarder rows are positioned to overlap the sub-pixel regions. 
 
     
     
       17. The display apparatus according to  claim 16 , wherein the sub-pixel regions comprise first sub-pixel regions and second sub-pixel regions, and the predetermined angle is different in the first sub-pixel regions and the second sub-pixel regions, respectively. 
     
     
       18. The display apparatus according to  claim 17 , wherein the sub-pixel regions further comprise third sub-pixel regions, and the predetermined angle in the third sub-pixel regions is different to the predetermined angles in the first sub-pixel regions and the second sub-pixel regions. 
     
     
       19. The display apparatus according to  claim 18 , wherein the sub-pixel regions further comprise fourth sub-pixel regions, and the predetermined angle in the fourth sub-pixel regions is different to the predetermined angles in the first sub-pixel regions, the second sub-pixel regions and the third sub-pixel regions.